Solid material comminution or disintegration – Apparatus – Cooperating comminuting surfaces
Patent
1997-02-11
1999-08-17
Rosenbaum, Mark
Solid material comminution or disintegration
Apparatus
Cooperating comminuting surfaces
B02C 204
Patent
active
059381337
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a gyratory crusher for crushing frangible and friable material having a gyrating crushing head and, in particular, to a support assembly for use in the crusher to support the crushing head.
BACKGROUND OF THE INVENTION
Australian Patent Specification 618545 (AU-B-19935/88) discloses a gyratory crushing apparatus including a bowl and a crushing head. A support assembly is arranged to support the head at opposite axial ends thereof to dispose the head at an angle to the central axis of the bowl. The crushing head has a gyratory axis which intersects with the central axis of the bowl at a pivot point located at the bottom of the crushing head. The crushing apparatus further includes a drive assembly for driving the crushing head about the pivot point causing the top of the crushing head to oscillate in a direction substantially transverse to the central axis of the bowl and to cause the bottom of the crushing head to oscillate predominantly in a direction parallel to the central axis. In the illustrated embodiments of specification 618545, the support assembly includes a rotatable shaft connected at one axial end to the drive assembly and journalled or pin mounted at its other axial end to an upper end of the crushing head, and a universally pivotable joint including a knuckle on which a lower end of the head is seated. The connection between the rotatable shaft and the crushing head is arranged to permit relative rotational movement between the shaft and the head.
A problem with the support assembly disclosed in specification 618545 is that precise adjustment is required to establish and maintain the proper geometric relationship between the vertical axis of the bowl, the rotatable shaft and the lower crushing head knuckle. As it has been found difficult to achieve the required precision with reliability or repeatability, the apparatus has not always performed satisfactorily and can suffer premature mechanical damage.
An aim of the present invention is to provide an improved support assembly for a gyratory crushing apparatus which at least ameliorates the above problem.
SUMMARY OF THE INVENTION
The invention provides a gyratory crushing apparatus, for crushing frangible or friable material, the apparatus including a bowl having an inner wall which defines a chamber for receiving the material, the chamber having a central axis and terminating in a throat defining a central discharge opening, a crushing head disposed in the bowl, the head having upper and lower ends which are interconnected by a peripheral wall which is concentric with respect to a gyratory axis of the head, a support assembly by which the head is supported in the chamber and which includes a shaft, and a drive arrangement coupled to the shaft, wherein the shaft is of integral construction having upper and lower portions, the head being mounted on the upper portion, with the upper portion having an axis substantially co-incident with the gyratory axis of the head, and the lower portion having an axis which is substantially co-incident with the central axis of the bowl, the axes of the upper and lower portions of the shaft intersecting at a fixed point located proximate to, or co-incident with, the lower end of the head such that, with rotation of the shaft about the axis of its lower portion under the action of the drive arrangement, gyratory motion is imparted to the head to provide a crushing action between the bowl and the peripheral wall of the head, on material received in the chamber.
The configuration of the shaft of the support assembly and the location of the crushing head on the shaft enables the crushing head to gyrate in a similar manner to that disclosed in specification 618545, but without requiring the use of a universally pivotable joint at the lower end of the crushing head. However, to fully achieve the movement of the crushing head disclosed in specification 618545, it is necessary for the crushing head to be mounted on the upper portion of the shaft in a manner e
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Bayliss John Andrew
Fielding Terry Richard
Shannon James Willian
Rosenbaum Mark
Wescone Crushers Pty Ltd
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